Spectravideo MKI, Сервисное – Техническое руководство, Страница: 19 / 134

SA200 MAINTENANCE EQUIPMENT
A l i g nme nt D i sk e t t e
The SA124 a l i gnme nt d i sket t e i s us e d for alignment of the SA200 . The fol l ow ing
a d j u s tme n t s and ch e c k s c an
be
ma d e u s ing
the
SA12 4 .
a . Rea d/Wri t e h e a d ra d i a l adjus tmen t us ing trac k 16.
b . I nd ex Pho to d e t e c t or a l i gnme nt u s ing
track
01 .
c . Tra ck 00 i s re corded w i t h a 12 5 kHz signal ( 2 F ) . Th i s t rack i s u s e d to
d e s igna t e i f t he h e a d is pos i t i one d over track 00 when t he track 00
i nd i c a t ion i s t ru e.
d. Tra ck 34 ha s a 125 kHz signa l (2 F ) re corded, and s p e c i f ie s i f the h e a d
i s pos i t ione d ov er t r a c k 3 4 . I t i s also u sed for r e f erence purpo s e s .
Ca u t i on shou l d b e exerc i s e d no t to d e s troy
pre-recorded
a l i gnme n t tra c k s.
The se track s are: 00, 0 1 , 15, 1 6, 17 and 3 4 . T he wr i t e p ro t e c t t ab s hou l d
a l way s be i n s ta l l e d on t h e SA12 4 t o p re ven t acc i d ent a l wri t ing on the d i s k e t t e.
Exerc i s er
The exerc i s er u s e d on t h e SA2 00 cons i s t s of
an
809 exe rc i s er w i t h a spe c i a l
c ab l e s e t . Th i s exerc i se PCB c an b e u s e d in a s t and a l one mod e , bu i l t i n to a
t e s t s t a t i on , or u s e d i n a t e s t er for f i e ld service.
T he exerc i s e r e nab l e s t he u s er to per form all a d j u s tment s and checks requ i re d
on t h e SA2 00 d r i ve. I t ha s no i n t el l i g e n t d a t a hand l i ng capabi l i t ie s b u t can
wr i t e a 2F 125 kHz s i g n a l wh ich i s t he record i ng fre q uency used for amp l i t ude
c he cks on th e SA200 . The exe rc i se r can also s t ar t and s top the d r iv e motor,
and e n ab l e s rea d i n t he S A 2 00 to a l low check ing of proper read back s igna l s.
DIAGNOSTIC
I n t roduc t i on
In correc t op era t i ng proce dure s , f a u l t y programm ing , dama g e d d i ske t t e s, "sof t
e r rors" cre a ted by a irborne con t am i nan t s , and ot her ext erna l c a u s e s can produce
error s fa l s e l y a t tribute d to drive f a i l ure or m i s adju s tme n t . Un l e s s v i s u a l
i ns p e c t i on o f the d r i ve d i s c l os e s a n obv ious m i s a l ignme n t o r b roken p art,
attempt to re pea t t h e f au l t w i t h the or i g i na l d i s ke t t e , t h e n a t t emp t to
d up l i c a t e t he fau lt on a s e c ond d i ske t te.
3.4